help me please!!

do I need to use plan b? I'm not on the contraceptive pill yet but I have it. I was waiting for my period to start it and that's supposed to be soon according to my period tracker app.

but last night me and my boyfriend kind of had sex. I was a virgin and we planned on waiting but couldn't and we didn't use a condom. but he didn't cum inside me as we stopped and we don't think he pre cums as we've never noticed it before.

could I be pregnant? and if so would starting the contraceptive pill now stop the chance of pregnancy or do I need to take the emergency contraceptive pill